Three-phase Three Legs Power Transformers Asymmetrical Modes Study for Zigzag Windings Connection
Close
Articolul precedent
Articolul urmator
233 1
Ultima descărcare din IBN:
2020-07-29 11:13
Căutarea după subiecte
similare conform CZU
621.314.21 (4)
Electrical engineering (793)
SM ISO690:2012
BOŞNEAGA, Valeriu; SUSLOV, Victor. Three-phase Three Legs Power Transformers Asymmetrical Modes Study for Zigzag Windings Connection. In: Управляемые электропередачи Сборник трудов лаборатории управляемых электропередач Института энергетики АН Молдовы. 1 ianuarie 2007 - 31 decembrie 2017, Chişinău. Chișinău, Republica Moldova: Институт энергетики, 2017, pp. 24-29.
EXPORT metadate:
Google Scholar
Crossref
CERIF

DataCite
Dublin Core
Управляемые электропередачи 2017
Sesiunea "Управляемые электропередачи"
Chişinău, Moldova, 1 ianuarie 2007 - 31 decembrie 2017

Three-phase Three Legs Power Transformers Asymmetrical Modes Study for Zigzag Windings Connection


CZU: 621.314.21
Pag. 24-29

Boşneaga Valeriu, Suslov Victor
 
Institute of Power Engineering of ASM
 
Disponibil în IBN: 25 iunie 2020


Rezumat

Based on the previously proposed model the simulations were made and characteristic features
of steady asymmetric modes of three-phase core type (three leg) transformer were investigated for zigzag
winding connection, taking into consideration the electromagnetic coupling of windings, located on
different legs. Calculations and analysis were conducted based on distribution transformer 100 kVA,
10/0.4 kV and include the most typical steady unbalanced conditions, arising at various short circuits,
including those, accompanied by the presence of zero sequence magnetic flux. For the considered modes
vector diagrams of currents and voltages, as well as the relative values of the magnetic flux were
constructed, which provide a clear visual representation of their features. It was demonstrated, that if the
numbers of secondary windings turns are unequal, zigzag scheme no longer has advantages in asymmetric
modes. These advantages also disappear at single-phase short-circuit of one secondary winding.
Additional measures should be taken for the reliable protection against such short-circuits and prevention
of transformer damage.



Cuvinte-cheie
Power Transformer, core type, three limbs, asymmetric modes, zigzag, zero sequence, magnetic flux